Power transmitter for power tables



Oct. 9, 1934. 1. F. WEBB- POWER TRANSMITTER FOR POWER TABLES Filed Dec. 15, 1953 Patented Oct. 9, 1934 POWER TRANSMITTER FOR POWER TABLES Irving F. Webb, Elizabeth, N. J., assignor to The Singer Manufacturing Company, Elizabeth, N. J a corporation of New Jersey Application December 15, 1933, Serial No. 702,472

Claims. (01. 192-17) NETED STATES PATENT OFFICE This invention relates to improvements in power-transmitters for sewing and like machines, and more particularly in the power-transmitter forming the subject of my pending patent ap- 5 plication Serial No. 685,996, filed Aug. 21, 1933, according to which power may be transmitted at will from a constantly-running driving pulley to a pulley of the driven machine.

The primary object of the present invention is to better adapt the power-transmitter to meet the requirements of different operators. The invention also aims to eliminate objectionable protuberances in connection with the application of spring pressure to the shifting-lever of the translii mitter and, nevertheless, provide for convenient assemblage of the parts.

With the foregoing and other objects in View, as will hereinafter appear, the invention comprises the devices, combinations and arrange- 26 ments of parts hereinafter set forth and illustrated in the accompanying drawing of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

In the drawing, Fig. 1 is a side elevation, partly in vertical section, of a power-transmitter as applied to a power-table. Fig. 2 is a fragmentary horizontal section of the power-transmitter, sub- 36 stantially on the line 2-2 of Fig. 1, omitting the shift-lever and the friction-brake material.

Referring to the drawing, the power-transmitter is shown as applied to a power-table having a table-top 1 upon which a sewing or other machine (not shown) is secured. The table-top 1 is mounted upon a supporting structure including, in the present instance, an inverted U-shaped end rail 2 disposed transversely of and underlying the table-top 1.. Entering the end rail 2 and suitably secured thereto, as by welding, are the upper ends of supporting standards (only one of which is shown in the drawing), each comprising a primary channel-bar leg-member 3 and a supplementary channel-bar leg-member 4 slidingly disposed for vertical adjustment within the leg-member 3, said'leg-members being substantially U-shaped in horizontal section.

In order to provide for ready replacement of the table-top 1, the power-transmitter is in the present case attached directly to the supporting structure of the table-top. The power-transmitter comprises an angular hanger having a foot 5, a bracket-member 6 depending vertically from the foot 5, and a lateral extension 7.

, Fixedly carried by the vertical bracket-member 6 of the hanger is the horizontally disposed, tubular stud-shaft 8 upon which are rotatably journaled the driving and driven elements 9 and 10, of which the driving element 9 comprises a stepped pulley having belt connections (not v shown) with any suitable power source. The driven element 10 is in the form of a pulley adapted to be connected by a suitable belt (not shown) with a machine upon the table-top'l, said driven element being disposed in spaced relation to the depending bracket-member 6 of the hanger.

The driving element 9 is slnitable axially of the stud-shaft 8 into frictional engagement with the driven element 10 by means of a three-armed shift-lever fulcrumed upon the lateral extension 7 of the hanger by means of a pivot-bolt 12. One arm 13 of said shift lever adjustably carries a thrust-plug 14 for engagement with a thrustreceiving disk 15 upon-the driving element 9. A second arm 16 of said lever terminates in an apertured ear 1? overhanging the space between the driven element and the bracket-member, 6. Adjacent to said ear 17, the shift-lever has a claw 18 overhanging the driven element 10 for engagement with a friction or braking material 19 positioned to engage the grooved periphery of the driven element 10. The third arm 20 of said shift-lever has its free end connected to a rod 21 for. operation by a suitable treadle or 86 knee-shift (not shown). The power-transmitter also preferably includes the usual belt-guards'22 and 23, as well as the oil-well 24 from which lubricant is conducted by wicking 25 to the bearings of the rotating elements of the transmitter. The rounded foot 5 of the transmitter-hanger is supported for angular adjustment upon'bolts, as 26, extending-horizontally, through the endrail 2 and secured by nuts, as 2'7, said end-rails being preferably reinforced by spacing tubes, as 28. Fulcrumed upon the hanger-bracket 6, be-

low the bolts 26 and by means of a pivot-bolt 29, is a two-armed tie-lever 30, 31. The free end of the lever-arm 30 is provided with a slot 32, elongated lengthwise of the lever and entered by a screw 33 threaded into a clamp-block 34 disposed within the channel of the U-shaped legmember 4. Threaded into the clamp-block 34 to extend in a directiontransverse to the screw 33 is a clamp-block securing screw 35 which, when partially unthreaded in the operative position of the clamp-block, engages the inner face of the leg-member 4 and thereby serves to releasably clamp the block 34 to said leg-member. V

crum 12 to release the driving element 9 from;

engagement by said shift-lever and to effect brak ing of the driven element 10: Y i

It is evident, from the foregoing description, that the clamp-block 34 and its adjustable con,-

nection to the transmitter-hanger. by means or" the lever 30, 31, provides for convenient angular adjustment of the transmitter to thereby accurately apply the power-transmitter to a power table. 7

the clamp-blook 34 upon the leg-member 3 eii'ects the canting of the lever 30, 31' about the pivot-bolt 29, the'tension of the spring 37 is correspondingly-adjusted. Consequently the tensionof. the spring- 37 may be readily adapted t'ojmeet the requirements of the individual operator, it being understood of course that some operatorsrequire lighter and-others comparativelygheavier tensioning means for controlling the-shift-lever. It will be appreciated that while the present-tension-spring arrangement eliminatesobjectionable protuberances upon the transmitter, it is nevertheless readily accessible for replacementin case of breakage. Furthermore,

, adjustment of the tension of the spring may be readily effected; because of the accessibility of the clamp-block 34, and the ease. of vertical ad"- justment thereof 'at the time of "setting up of the transmitter or subsequently thereto.

Having thus set forththe nature'of the invention,what--Iclaim-hereinisz r 1. A driving device for power-tables having a table-supporting frame, comprising, a hanger, supporting means upon said frame for said v: hanger; driving and driven elements rotatably journaled upon said hanger, a shift-lever fulcrumed' upon said' hanger for establishing driving relationship between said elements and for brakingthedriven element, a tie-lever fulcrumed upon, said hanger, a spring connection'between said'levers for yieldingly urging said-shift-lever into braking position, and means for adjustably securing 'saidtie-le'ver'to said frame; to thereby effect adjustment of the tension'of said spring. 2:,iA'drivin'g device for power-tables having-a table-supporting frame, comprising, a hanger,

supporting means upon said" frameior' said hanger, driving and vdriverr elements rot'atably 'journaledj upon said hanger, a shiftalever'ful crumed" uponsaid hanger for establishing'drivi-ng relationshipbetween said elements and'for braking the driven element, afcjlarnp-member d,

However, as any vertical adjustment. on:

justably secured upon said frame, a tie-lever connecting said clamp-member and hanger, and a spring connection between said levers to yieldingly urge said shift-lever into driven-elementbraking position.

3. A driving device for power-tables having a table-supporting frame, comprising, a hanger,

means for securing said hanger for angular adjustment upon said frame, driving and driven .jelements rotatably journaled upon said hanger,

adjustably secured upon said frame for effecting angular. adjustment of said hanger and simultaneously therewith'effecting adjustment of the tension. of said spring.

4. A driving device for power-tables having a table-supporting frame, comprising, a hanger having a foot secured upon said-frame'and pro.- vided with a depending bracket-member, a driven element rotatably journaled upon said bracketrne nber and disposed in spaced relation thereto, a' rotary driving element shiftable into and out of clutching engagement with said driven element, a shift-lever fulcrurned upon said hanger for shifting said driving element and for braking 'saiddriven element, a spring 'connected' to said shift-lever and disposed between said driven element and said depending bracket-memher of the hanger, said spring acting in adirecti'on toyieldingly urge said shiftlever into'braking position, aspring-tensioning member movably supported by said bracketmember, and adjustable securing-means for said spring-tensioning member.

'5; A driving device for'power-tab-les having 'a table-supporting frame,- comprising, a hanger 1 having a foot secured upon said frame and provided with a depending bracket-member, a driven element rotatably journaled upon said bracket-member and'disposed in spaced relation thereto, a rotary and sidewise shiftable driving element journaled upon said hanger, a shiftlever fulcrumed upon said hanger for movement in one direction to efiect'clutching engagement betweensaid driving and driven elements, said shift-lever acting to brakesaid driven element in a reverse movement of the lever, a spring connected to said shift lever and acting-' to yieldingly urge theshift-lever into braking position, said spring being disposed between said depending bracket member of the hanger and said'driv'en element; aspring-tensioning member pivotally mounted upon said depending bracket-rnember, andmeans adjustably' attached tosaid frame for securing said tensioning member in different adjusted positions thereof;

IRVING F. WEBB.

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